﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace 文本批量替换
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }
        
        private void Form1_Load(object sender, EventArgs e)
        {
            this.progressBar1.Hide();
          

        }

     
        
        private void str_replace(string afile,string oldstr,string newstr )
        {
            
            if (afile=="")
            {
                MessageBox.Show(this, "文件不存在", "提示");
                return;        
            }
            if (File.Exists(afile) == false)
            {
                MessageBox.Show(this, "文件不存在", "提示");
                return;
            }
            Encoding encode = Encoding.GetEncoding("GB2312");
            encode = TxtFileEncoder.GetEncoding(afile, encode);
           StreamReader TxtReader = new StreamReader(afile, encode);
            string FileContent;
            
            FileContent = TxtReader.ReadToEnd();
            TxtReader.Close();
            TxtReader.Dispose();
            FileContent = FileContent.Replace(oldstr, newstr);
            StreamWriter TxtWriter = new StreamWriter(afile, false, encode);
            TxtWriter.Write(FileContent);
            TxtWriter.Close();
        }

        static List<FileInfo> FileList = new List<FileInfo>();
       // static int dirNum;
    
        public static List<FileInfo> GetAllFiles(DirectoryInfo dir,string par )
        {
            FileInfo[] allFile = dir.GetFiles(par, SearchOption.AllDirectories);
            foreach (FileInfo fi in allFile)
            {
                FileList.Add(fi);
            }
            //DirectoryInfo[] allDir = dir.GetDirectories();
            //dirNum++;
            //if (dirNum > 3) return FileList;
            //foreach (DirectoryInfo d in allDir)
            //{
               

            //    GetAllFiles(d,par);
            //}
 
            return FileList;
        }

        private void Button_replace_Click(object sender, EventArgs e)//点击【替换】
        {
            
            //list数组步用指定长度
            List<string> bflie = new List<string>();
            this.listBox1.Items.Clear();
            //读取路径下的信息
            if(this.textBox1.Text=="")
            {
                System.Windows.Forms.MessageBox.Show(this, "文件夹不存在", "提示");
                return;
            }
            DirectoryInfo folder = new DirectoryInfo(this.textBox1.Text);
            if (!folder.Exists)
            {
                System.Windows.Forms.MessageBox.Show(this, "文件夹不存在", "提示");
                return;
            }

            FileList.Clear();
            //dirNum = 0;
            GetAllFiles(folder, this.textBox4.Text);
             this.progressBar1.Maximum = FileList.Count;
             this.progressBar1.Minimum = 0;
             int num=0;
             this.progressBar1.Show(); 
             if (this.textBox2.Text == "")
             {
                 MessageBox.Show(this, "字符串为空", "提示");
                 return;
             }
            foreach (FileInfo allTEXTfile in FileList)
            {
                //Console.WriteLine(allTEXTfile);
                this.listBox1.Items.Add(allTEXTfile.FullName);
                str_replace(allTEXTfile.FullName, this.textBox2.Text, this.textBox3.Text);
                num++;
                this.progressBar1.Value = num;
            }
            this.progressBar1.Hide();
            MessageBox.Show(this, "替换完成", "提示");
             // Console.Read();
 
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void fileSystemWatcher1_Changed(object sender, FileSystemEventArgs e)
        {

        }

        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
        {

        }

        private void Button_file_Click(object sender, EventArgs e)//点击【选择文件夹】
        {
          
            if (folderBrowserDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                if (string.IsNullOrEmpty(folderBrowserDialog1.SelectedPath))
                {
                    System.Windows.Forms.MessageBox.Show(this, "文件夹路径不能为空", "提示");
                    return;
                }
                this.textBox1.Text = folderBrowserDialog1.SelectedPath;
                     
            }
        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            if (this.textBox2.Text == "")
            { this.Button_replace.Enabled=false; }
            else {
                this.Button_replace.Enabled = true;
            }
        }

        private void label1_Click_1(object sender, EventArgs e)
        {

        }

        private void listBox1_SelectedIndexChanged_1(object sender, EventArgs e)
        {
          
            System.Diagnostics.Process.Start("notepad.exe", listBox1.SelectedItem.ToString());
        }

        private void textBox1_DragDrop(object sender, DragEventArgs e)
        {
            MessageBox.Show(this, DataFormats.FileDrop, "提示"); ;
        }

        private void Form1_DragDrop(object sender, DragEventArgs e)
        {
            //StringBuilder filesName = new StringBuilder("");
            Array file = (System.Array)e.Data.GetData(DataFormats.FileDrop);
            foreach (object I in file)
            {
                string str = I.ToString();
                textBox1.Text = str;
            }
        }

        private void tableLayoutPanel1_Paint(object sender, PaintEventArgs e)
        {

        }
    }


    /// <summary>   
    /// 用于取得一个文本文件的编码方式(Encoding)。   
    /// </summary>   
    public class TxtFileEncoder
    {
        public TxtFileEncoder()
        {
            //   
            // TODO: 在此处添加构造函数逻辑   
            //   
        }
        /// <summary>   
        /// 取得一个文本文件的编码方式。如果无法在文件头部找到有效的前导符，Encoding.Default将被返回。   
        /// </summary>   
        /// <param name="fileName">文件名。</param>   
        /// <returns></returns>   
        public static Encoding GetEncoding(string fileName)
        {
            return GetEncoding(fileName, Encoding.Default);
        }
        /// <summary>   
        /// 取得一个文本文件流的编码方式。   
        /// </summary>   
        /// <param name="stream">文本文件流。</param>   
        /// <returns></returns>   
        public static Encoding GetEncoding(FileStream stream)
        {
            return GetEncoding(stream, Encoding.Default);
        }
        /// <summary>   
        /// 取得一个文本文件的编码方式。   
        /// </summary>   
        /// <param name="fileName">文件名。</param>   
        /// <param name="defaultEncoding">默认编码方式。当该方法无法从文件的头部取得有效的前导符时，将返回该编码方式。</param>   
        /// <returns></returns>   
        public static Encoding GetEncoding(string fileName, Encoding defaultEncoding)
        {
            FileStream fs = new FileStream(fileName, FileMode.Open);
            Encoding targetEncoding = GetEncoding(fs, defaultEncoding);
            fs.Close();
            return targetEncoding;
        }
        /// <summary>   
        /// 取得一个文本文件流的编码方式。   
        /// </summary>   
        /// <param name="stream">文本文件流。</param>   
        /// <param name="defaultEncoding">默认编码方式。当该方法无法从文件的头部取得有效的前导符时，将返回该编码方式。</param>   
        /// <returns></returns>   
        public static Encoding GetEncoding(FileStream stream, Encoding defaultEncoding)
        {
            Encoding targetEncoding = defaultEncoding;
            if (stream != null && stream.Length >= 2)
            {
                //保存文件流的前4个字节   
                byte byte1 = 0;
                byte byte2 = 0;
                byte byte3 = 0;
                byte byte4 = 0;
                //保存当前Seek位置   
                long origPos = stream.Seek(0, SeekOrigin.Begin);
                stream.Seek(0, SeekOrigin.Begin);

                int nByte = stream.ReadByte();
                byte1 = Convert.ToByte(nByte);
                byte2 = Convert.ToByte(stream.ReadByte());
                if (stream.Length >= 3)
                {
                    byte3 = Convert.ToByte(stream.ReadByte());
                }
                if (stream.Length >= 4)
                {
                    byte4 = Convert.ToByte(stream.ReadByte());
                }
                //根据文件流的前4个字节判断Encoding   
                //Unicode {0xFF, 0xFE};   
                //BE-Unicode {0xFE, 0xFF};   
                //UTF8 = {0xEF, 0xBB, 0xBF};   
                if (byte1 == 0xFE && byte2 == 0xFF)//UnicodeBe   
                {
                    targetEncoding = Encoding.BigEndianUnicode;
                }
                if (byte1 == 0xFF && byte2 == 0xFE && byte3 != 0xFF)//Unicode   
                {
                    targetEncoding = Encoding.Unicode;
                }
                if (byte1 == 0xEF && byte2 == 0xBB && byte3 == 0xBF)//UTF8   
                {
                    targetEncoding = Encoding.UTF8;
                }
                //恢复Seek位置         
                stream.Seek(origPos, SeekOrigin.Begin);
            }
            return targetEncoding;
        }



        // 新增加一个方法，解决了不带BOM的 UTF8 编码问题   

        /// <summary>   
        /// 通过给定的文件流，判断文件的编码类型   
        /// </summary>   
        /// <param name="fs">文件流</param>   
        /// <returns>文件的编码类型</returns>   
        public static System.Text.Encoding GetEncoding(Stream fs)
        {
            byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
            byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
            byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM   
            Encoding reVal = Encoding.Default;

            BinaryReader r = new BinaryReader(fs, System.Text.Encoding.Default);
            byte[] ss = r.ReadBytes(4);
            if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00)
            {
                reVal = Encoding.BigEndianUnicode;
            }
            else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41)
            {
                reVal = Encoding.Unicode;
            }
            else
            {
                if (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF)
                {
                    reVal = Encoding.UTF8;
                }
                else
                {
                    int i;
                    int.TryParse(fs.Length.ToString(), out i);
                    ss = r.ReadBytes(i);

                    if (IsUTF8Bytes(ss))
                        reVal = Encoding.UTF8;
                }
            }
            r.Close();
            return reVal;

        }

        /// <summary>   
        /// 判断是否是不带 BOM 的 UTF8 格式   
        /// </summary>   
        /// <param name="data"></param>   
        /// <returns></returns>   
        private static bool IsUTF8Bytes(byte[] data)
        {
            int charByteCounter = 1;　 //计算当前正分析的字符应还有的字节数   
            byte curByte; //当前分析的字节.   
            for (int i = 0; i < data.Length; i++)
            {
                curByte = data[i];
                if (charByteCounter == 1)
                {
                    if (curByte >= 0x80)
                    {
                        //判断当前   
                        while (((curByte <<= 1) & 0x80) != 0)
                        {
                            charByteCounter++;
                        }
                        //标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X　   
                        if (charByteCounter == 1 || charByteCounter > 6)
                        {
                            return false;
                        }
                    }
                }
                else
                {
                    //若是UTF-8 此时第一位必须为1   
                    if ((curByte & 0xC0) != 0x80)
                    {
                        return false;
                    }
                    charByteCounter--;
                }
            }
            if (charByteCounter > 1)
            {
                throw new Exception("非预期的byte格式!");
            }
            return true;
        }
    }


   
}
